COVERING DEVICE OF LAPPED BELT

PROBLEM TO BE SOLVED: To detect a joint part of a canvas without spoiling winding of the canvas on a belt core body by furnishing a first moving means to clamp the canvas between receiver rolls by moving a presser roll, a second moving means to move the presser roll and the receiver rolls in a state of clamping the canvas and a roll displacement detection means of the presser roll. SOLUTION: A presser cylinder 13A corresponding to a canvas to be used moves to extend, the canvas being carried is clamped between a presser roll 11A and a receiver roll 12, two of the rolls 11A relatively moves in the delivery direction of the canvas in a state of clamping the canvas, when there is a joint part on the canvas, the presser roll 11A rises, accordingly, a displacement detection sensor 15a detects it, and existence of the joint part is judged. Positions to start and finish winding of the canvas on a belt core body are set by a range setting switch provided on a moving cylinder 14, and a position of the joint part of the canvas is detected by motion of the range setting switch.